10.11 Double End of line resistors
When a Sensor, and tamper are wired into the same zone this is called End of Line Zone (EOL). The Atlas panel uses
resistors on all of its end of line zones. Two resistor values are used, these are 2K2 and 4K7.
To identify the two resistors, coloured bands on the body are used. These are as follows:
2K2
4K7
Fourth Band
Red
Red
Red
Fourth Band
Yell ow
Violet
Red
Any unused zones should NOT be left open circuit. These should have a 2K2 resistor inserted, Refer to diagram below.
NOTE: when the panel and sensors are wired using end of line resistors, to enable the zone to detect alarm and tamper,
the system must be configured in System Option 1. Refer to Page 25.
10.11.1 Wiring Unused Zones In Double End Of Line.
2K2 Resistor
Any unused zones should be linked out as shown using a 2K2 resistor if the panel is to be used in Double End Of Line
mode.
10.11.2 Wiring Two or More Sensors With End Of Line Resistors To A Single Zone.
NOTE: only one 2K2 resistor should be used per zone. The 2K2 resistor should be installed in the last detector in the
series to protect all the zone tamper wiring.
2K2
4K7
4K7
Aux. Aux.
Up to ten sensors or door contacts may be wired on each zone.
10.12 Telephone Connections
Line In
Telephone
Network
Line Out
Rest Of
Premises
Page 26
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